Tutorial on using stream in node.js

I went to learn OC these days, but I haven’t finished it yet. It’s still a long time before I change careers, so let’s review the knowledge of node.

There are many people coming and going in each language, but I can’t live without node. I don't use it for development, I just use js relatively much, so it is better to study node. The status of stream in node is very high. I'll take a look at this content in my spare time. I'm still a newbie on the road to node.

Today I downloaded the nodeschool course to see, there is an example in it. (I modified it a little)

var concat = require('concat-stream');
var http = require('http');
var qs = require('querystring');
 
  var server = http.createServer(function (req, res) {
    if (req.method === 'POST') {
      req.pipe(concat(function (body) {
        body = qs.parse(body.toString())
        res.end(Object.keys(body).join('\n')); 
      }));
    }
    else res.end();
  });
  server.listen(5000);

This question means that you are asked to reverse the post data, but I will not do it. The principle is the same, but the requirements are different. We use the concat plug-in to direct the data flow to concat when the form is submitted. This example is to take the data from the form post.

For testing, I use the request library.

var request = require(‘request')
request.post(‘ http://127.0.0.1:5000 ‘, {form:
 
{
 
“name”: “ryan”,
 
“age” : 23
 
}
 
}, function(err,res,body){
 
console.log(‘接收成功:')
 
console.log(res[‘body']) // name age
 
})

Start the server, and then run the test. You can see that we posted this object. The concat-stream module is mainly used to connect buffers. My understanding is that when you transmit in the form of a buffer, you can transmit any type. In npmjs, it transmits a picture. After we receive it, Then we get the data of this image, and we can use this to upload and copy. The principles are the same.

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